The term was coined in 1970 by the Japanese roboticist Masahiro Mori. He said humans can relate to robots — think R2-D2 — but once they get too humanlike, but not close enough — think the animated Angelina Jolie in Beowulf — they feel disgust. That disgust — that "uncanny valley" — subsides at the other side: when the robot is indistinguishable from reality.

So, have we crossed that valley with this animation?

As Mashable reports, if you look closely the teeth are not quite right, but does it make the animation creepy?

If you want to dive in to the topic, there's a great talk given by NVIDIA Co-founder and CEO Jen-Hsun Huang during his keynote at the GPU Technology Conference in San Jose earlier this month: